Migrate Zimbra to Thunderbird software is a perfect complete solution tool. This software maintains all the folder structure during the whole conversion process. There is no file size limitation, you can convert number of files at a time without losing any data. This software supports all the windows editions like- 10, 8.1, 8, 7 & etc. This software comes with preview facility for better conversion process. Zimbra to Thunderbird software supports simple GUI, so anyone can easily handle & work with software without any technical knowledge help.